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CVE-2026-55771— CedarJava has policy injection, type confusion, and incorrect equality comparison vulnerabilities

Quick assessment

Affected
cedar-policy cedar-java
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cedar CedarJava是Cedar组织的一款消息队列中间件。 CedarJava 4.9.0之前版本存在安全漏洞，该漏洞源于EntityIdentifier.equals()方法中null和自引用分支逻辑颠倒，可能导致不正确的相等性比较，影响执行自己的实体标识符相等性检查的集成者。

CVSS 8.8 · High EPSS 0.57% · P47

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
cedar-policy cedar-java < 4.9.0 affected
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I. Basic Information for CVE-2026-55771

Vulnerability Information
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Vulnerability Title
CedarJava has policy injection, type confusion, and incorrect equality comparison vulnerabilities
Source: CVE Program / CVE List V5
Vulnerability Description
CedarJava is an open source Java implementation of the Cedar policy language, used for fine-grained authorization decisions. In versions prior to 4.9.0, the EntityIdentifier.equals() has inverted null/self branches which could lead to incorrect equality comparisons. The EntityIdentifier.equals() method has inverted logic for null and self-reference checks, returning true for null comparisons and false for self-comparisons. This does not affect Cedar authorization decisions (computed in Rust from JSON), but could affect integrators who perform their own equality checks on entity identifiers. This issue has been fixed in version 4.9.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
CedarJava 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cedar CedarJava是Cedar组织的一款消息队列中间件。 CedarJava 4.9.0之前版本存在安全漏洞，该漏洞源于EntityIdentifier.equals()方法中null和自引用分支逻辑颠倒，可能导致不正确的相等性比较，影响执行自己的实体标识符相等性检查的集成者。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cedar-policy cedar-java < 4.9.0 -

II. Public POCs for CVE-2026-55771

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10578 chars
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III. Intelligence Information for CVE-2026-55771

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Vendor Advisories for CVE-2026-55771 (1)

Same Patch Batch · cedar-policy · 2026-07-13 · 3 CVEs total

CVE-2026-55772 8.8 HIGH CedarJava has a type confusion vulnerability
CVE-2026-55773 8.8 HIGH CedarJava has a policy injection vulnerability

IV. Related Vulnerabilities

Same product: cedar-java
Same vendor: cedar-policy
Same weakness: CWE-94

V. Comments for CVE-2026-55771

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